javascript - Custom HTML Tag -

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i have 2 questions concerning custom html tags.

when created custom html tag , tried custom html file (code below) in different browsers. wondering if can test in older versions of safari , see compatibility custom html tags.

and need javascript stuff mentioned in these article?

https://www.html5rocks.com/en/tutorials/webcomponents/customelements/

https://developers.google.com/web/fundamentals/architecture/building-components/customelements

<style>  custom-tag {     background-color: red;     padding: 100px; }  </style>  <custom-tag>this custom tag.</custom-tag>  <script>  alert(document.getelementsbytagname('custom-tag')[0].tagname)  </script>

the results of code in internet explorer...

ie6 = js works not css

ie7 = js works not css

ie8 = js works not css

ie9 = js works not css

ie10+ = works

according caniuse, custom elements supported in:

  • chrome 33 , onwards
  • opera 20 , onwards
  • android 4.4.4 , onwards
  • firefox 23 , onwards (with dom.webcomponents.enabled preference in about:config)

and not supported in:

  • any version of ie (although own tests confirm is supported in ie 11)
  • any version of edge (although own tests confirm is supported in edge 20)
  • any version of safari

this in relation working draft (last updated 13 october 2016). it's quite possible caniuse has not been updated cover latest revision of draft.

hope helps!


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